WO2023010593A1 - Circuit d'attaque de pixel et terminal mobile - Google Patents

Circuit d'attaque de pixel et terminal mobile Download PDF

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Publication number
WO2023010593A1
WO2023010593A1 PCT/CN2021/111781 CN2021111781W WO2023010593A1 WO 2023010593 A1 WO2023010593 A1 WO 2023010593A1 CN 2021111781 W CN2021111781 W CN 2021111781W WO 2023010593 A1 WO2023010593 A1 WO 2023010593A1
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WO
WIPO (PCT)
Prior art keywords
thin film
transistor
driving circuit
voltage
voltage dividing
Prior art date
Application number
PCT/CN2021/111781
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English (en)
Chinese (zh)
Inventor
胡道兵
Original Assignee
Tcl华星光电技术有限公司
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Publication date
Application filed by Tcl华星光电技术有限公司 filed Critical Tcl华星光电技术有限公司
Priority to US17/602,790 priority Critical patent/US20240169889A1/en
Publication of WO2023010593A1 publication Critical patent/WO2023010593A1/fr

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/16—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits
    • H01L25/167—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits comprising optoelectronic devices, e.g. LED, photodiodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
    • H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
    • H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
    • H01L27/1222—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or crystalline structure of the active layer
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor

Definitions

  • the present invention relates to the technical field of display panels, in particular to a pixel driving circuit and a mobile terminal.
  • Mini-LED backlight Compared with traditional backlight, Mini-LED backlight has excellent contrast.
  • the current driving architecture of Mini-LED display panels is mainly based on 2T1C, while Light-Emitting Diode (LED) is a current-driven device, and the backplane signal of the display panel under the active matrix driving technology is voltage-controlled, so , under this technology, the stability requirements for thin film transistor (Thin Film Transistor, TFT) devices are very high, especially the stability and uniformity of the driving thin film transistor used to drive light emitting diodes will directly affect the light emission of light emitting diodes brightness.
  • TFT Thin Film Transistor
  • MOSFET Metal-Oxide-Semiconductor Field-Effect Transistor
  • MOSFET Metal-Oxide-Semiconductor Field-Effect Transistor
  • the field effect transistor mainly works in the saturation region, and a small change in the data voltage received by the gate will cause a large change in the current of the drain, so that the pixel driving circuit under this design cannot achieve high grayscale. display controls.
  • the invention provides a pixel driving circuit and a mobile terminal, which effectively solves the problem that the pixel driving circuit cannot realize display control under high grayscale.
  • the present invention provides a pixel driving circuit, which is applied to a display panel, the display panel includes scanning lines and data lines, and the pixel driving circuit includes:
  • switch thin film transistors used to receive the data signals on the data lines according to the scan signals on the scan lines
  • a storage module electrically connected to the switching thin film transistor, for being charged by the data signal
  • the driving light-emitting module includes a driving unit, a light-emitting unit, and a voltage-dividing transistor connected in series, and has a power supply voltage access port and a grounding port for being driven by the data signal to emit light, wherein the voltage-dividing transistor is connected in series to the Between the drive unit and the ground port.
  • the number of gray levels of the display panel is proportional to the resistance of the voltage dividing transistor.
  • the voltage dividing transistor is a voltage dividing thin film transistor, the gate and the drain of the voltage dividing thin film transistor are electrically connected, and the ratio of the channel width and the channel length of the voltage dividing thin film transistor is equal to the The number of gray levels is directly proportional.
  • the pixel driving circuit further includes a control module, the control module is configured to adjust the power supply voltage connected to the pixel driving circuit so that the voltage-dividing thin film transistor works in a linear region or a saturation region.
  • the switching thin film transistor and the voltage dividing thin film transistor are amorphous silicon thin film transistors or indium gallium zinc oxide thin film transistors.
  • multiple voltage-dividing transistors there are multiple voltage-dividing transistors, and multiple voltage-dividing transistors are connected in series and/or in parallel.
  • the storage unit includes a capacitor, one end of the capacitor is electrically connected to the switching thin film transistor and the driving light-emitting module, and the other end of the capacitor is electrically connected to the ground port.
  • the drive unit includes a metal oxide semiconductor field effect transistor, the gate of the metal oxide semiconductor field effect transistor is electrically connected to the switching thin film transistor and the storage module, and the metal oxide semiconductor field effect transistor The drain of the effect transistor is electrically connected to the power supply voltage input port, and the source of the MOSFET is electrically connected to the ground port.
  • the light emitting unit is connected in series between the power supply voltage access port and the drive unit, or between the drive unit and the ground port.
  • the voltage dividing transistor has a first resistance value
  • the light-emitting unit includes a light-emitting diode
  • the light-emitting diode has a second resistance value, a minimum driving current value, and a maximum driving current value
  • the pixel driving circuit is connected to The ratio of the voltage value of the power supply voltage to the sum of the first resistance value and the second resistance value is between the minimum driving current value and the maximum driving current value.
  • the voltage dividing transistor is a voltage dividing crystal diode.
  • the present invention also provides a mobile terminal, which includes:
  • the source driver is connected to the data line.
  • the number of gray levels of the display panel is proportional to the resistance of the voltage dividing transistor.
  • the voltage dividing transistor is a voltage dividing thin film transistor, the gate and the drain of the voltage dividing thin film transistor are electrically connected, and the ratio of the channel width and the channel length of the voltage dividing thin film transistor is equal to the The number of gray levels is directly proportional.
  • the pixel driving circuit further includes a control module, the control module is configured to adjust the power supply voltage connected to the pixel driving circuit so that the voltage-dividing thin film transistor works in a linear region or a saturation region.
  • the switching thin film transistor and the voltage dividing thin film transistor are amorphous silicon thin film transistors or indium gallium zinc oxide thin film transistors.
  • the storage unit includes a capacitor, one end of the capacitor is electrically connected to the switching thin film transistor and the driving light-emitting module, and the other end of the capacitor is electrically connected to the ground port.
  • the drive unit includes a metal oxide semiconductor field effect transistor, the gate of the metal oxide semiconductor field effect transistor is electrically connected to the switching thin film transistor and the storage module, and the metal oxide semiconductor field effect transistor The drain of the effect transistor is electrically connected to the power supply voltage input port, and the source of the MOSFET is electrically connected to the ground port.
  • the light emitting unit is connected in series between the power supply voltage access port and the drive unit, or between the drive unit and the ground port.
  • the voltage dividing transistor has a first resistance value
  • the light-emitting unit includes a light-emitting diode
  • the light-emitting diode has a second resistance value, a minimum driving current value, and a maximum driving current value
  • the pixel driving circuit is connected to The ratio of the voltage value of the power supply voltage to the sum of the first resistance value and the second resistance value is between the minimum driving current value and the maximum driving current value.
  • the present invention provides a pixel driving circuit and a mobile terminal.
  • the pixel driving circuit is applied to a display panel.
  • the display panel includes scanning lines and data lines.
  • the switching thin film transistor for the data signal, the storage module electrically connected with the switching thin film transistor and used for being charged by the data signal, and the driving light emitting module, the driving light emitting module includes a driving unit, a light emitting unit and a voltage dividing transistor connected in series, and has a power supply voltage connection
  • the input port and the ground port are used to be driven by the data signal to emit light.
  • the voltage divider transistor is connected in series between the driving unit and the ground port.
  • the driving unit drives the light emitting unit to emit light according to the data signal when the voltage is divided by the voltage dividing transistor, so that when the data signal changes, the current in the light emitting unit can slowly increase, reducing the power received by the driving unit
  • the change of the current in the light-emitting unit caused by the change of the data signal of the pixel drive circuit can realize the display control under high gray scale, and because the resistance value of the voltage divider transistor can be changed by adjusting the power supply voltage, This makes the pixel driving circuit have higher real-time controllability.
  • FIG. 1 is a schematic structural diagram of a pixel driving circuit provided by an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a detailed structure of a pixel driving circuit provided by an embodiment of the present invention.
  • FIG. 3 a is a characteristic curve diagram of a voltage divider transistor in a pixel driving circuit provided by an embodiment according to the present invention.
  • FIG. 3b is another characteristic curve diagram of the voltage dividing transistor of the pixel driving circuit provided by the embodiment according to the present invention.
  • Fig. 4a is a characteristic curve diagram of the MOS transistor T3 before the voltage dividing transistor is connected in series in the pixel driving circuit provided by the embodiment according to the present invention.
  • FIG. 4b is a characteristic curve diagram of the MOS transistor T3 after the voltage divider transistors are connected in series in the pixel driving circuit provided by the embodiment of the present invention.
  • Fig. 5 is a schematic structural diagram of a mobile terminal provided by an embodiment according to the present invention.
  • FIG. 6 is a schematic diagram of a detailed structure of a mobile terminal provided by an embodiment of the present invention.
  • first and second are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features.
  • a feature defined as “first” or “second” may explicitly or implicitly include one or more of said features.
  • “plurality” means two or more, unless otherwise specifically defined.
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected, or electrically connected, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction of two components relation.
  • installation connection
  • connection connection
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected, or electrically connected, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction of two components relation.
  • a first feature being “on” or “under” a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them.
  • “above”, “above” and “above” the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.
  • “Below”, “beneath” and “under” the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.
  • the present invention is aimed at the pixel drive circuit with MOS tube as the driving transistor under the existing design, because a small change in the data voltage received by the gate of the MOS tube will cause a large change in the current of the drain, which leads to the design
  • FIG. 1 is a schematic structural diagram of a pixel driving circuit 10 provided according to an embodiment of the present invention. From FIG. 1, it is possible to intuitively see various components of the embodiment according to the present invention. and the relative positional relationship of each component.
  • the pixel driving circuit 10 is applied to a display panel, the display panel includes scanning lines and data lines, the pixel driving circuit 10 includes a switching thin film transistor T1, a storage module 11 electrically connected to the switching thin film transistor T1, and a driving light emitting module 12.
  • the switching thin film transistor T1 is used to receive the data signal DATA on the data line according to the scanning signal SCAN on the scanning line, so that the storage module 11 is charged by the data signal DATA, and the driving light-emitting module 12 is driven by the data signal DATA to emit light.
  • the driving light-emitting module 12 includes a driving unit 13, a light-emitting unit 14, and a voltage dividing transistor T2 connected in series.
  • the driving light-emitting module 12 has a power supply voltage access port 1 and a grounding port 2.
  • the voltage dividing transistor T2 is connected in series to the driving unit 13 and the grounding port 2. between.
  • the drive unit 13 is divided by the voltage divider transistor T2, according to the data
  • the signal DATA drives the light-emitting unit 14 to emit light, so that when the data signal DATA changes, the current in the light-emitting unit 14 can increase slowly, reducing the current in the light-emitting unit 14 caused by the change of the data signal DATA received by the driving unit 13.
  • the change of the current makes the pixel driving circuit 10 realize the display control under high grayscale.
  • the resistance value of the voltage dividing transistor T2 can be changed by adjusting the power supply voltage VDD, the pixel driving circuit 10 has a higher Real-time controllability.
  • FIG. 2 is a schematic diagram of the detailed structure of the pixel driving circuit 10 provided by the embodiment of the present invention. From FIG. 2, it can be seen intuitively that the embodiment of the present invention Each component, and the relative positional relationship of each component.
  • the above-mentioned storage module 11 includes a capacitor Cs
  • the above-mentioned driving unit 13 includes a MOS transistor T3
  • the above-mentioned light emitting unit 14 includes four light-emitting diodes LED, wherein:
  • the gate of the switching TFT T1 is electrically connected to the scan line
  • the drain of the switching TFT T1 is electrically connected to the data line
  • the source of the switching TFT T1 is electrically connected to one end of the capacitor Cs and the gate of the MOS transistor T3.
  • the switching thin film transistor T1 can be an amorphous silicon thin film transistor (a-Si TFT), or an indium gallium zinc oxide thin film transistor (IGZO TFT), and in this embodiment, the pixel driving circuit 10 only includes one switching thin film transistor T1, but in other embodiments formed by the present invention, the pixel driving circuit 10 may also include multiple switching thin film transistors, multiple switches The thin film transistors may be connected in series or in parallel, and the gate of each switching thin film transistor is electrically connected to the scanning line, and in an embodiment where a plurality of switching thin film transistors are connected in parallel, the drain of each switching thin film transistor Both electrodes are used to connect to the data signal DATA; in an embodiment in which a plurality of switching thin film transistors are connected in series, the drain of one of the plurality of switching thin film transistors is connected to the data signal DATA.
  • a-Si TFT amorphous silicon thin film transistor
  • IGZO TFT indium gallium zinc oxide thin film transistor
  • the storage module 11 only includes one capacitor, but in other embodiments of the present invention, the storage module 11 may also include multiple capacitors, and the multiple capacitors may be connected in series or Can be connected in parallel.
  • each capacitor is electrically connected to the gate of the MOS transistor T3 and the source of the switching thin film transistor T1, and the other end is electrically connected to the ground port 2; when multiple capacitors are connected in series In the connected embodiment, one end of one of the plurality of capacitors is electrically connected to the gate of the MOS transistor T3 and the source of the switching thin film transistor T1 , and one end of the other of the plurality of capacitors is electrically connected to the ground port 2 .
  • the gate of the MOS transistor T3 is electrically connected to the source of the switching thin film transistor T1 and one end of the capacitor Cs, the drain of the MOS transistor T3 is electrically connected to the cathode of the light-emitting diode LED, and the source of the MOS transistor T3 is electrically connected to the voltage dividing transistor T2 , and the MOS transistor T3 is used as a driving transistor in the pixel driving circuit 10 .
  • the light-emitting unit 14 includes four light-emitting diodes LEDs connected in series, but in other embodiments formed by the present invention, the number of light-emitting diodes LEDs in the light-emitting unit 14 can also be other values , and in this embodiment, the light-emitting unit 14 is connected in series between the power supply voltage access port 1 and the drive unit 13, but in other embodiments of the present invention, the light-emitting unit 14 can also be connected in series between the drive unit 13 and the ground between port 2.
  • the voltage dividing transistor T2 is connected in series between the drive unit 13 and the ground port 2.
  • the voltage dividing transistor T2 is a voltage dividing thin film transistor, and the gate and drain of the voltage dividing thin film transistor are electrically connected, and are connected to the MOS transistor T3
  • the source of the voltage-dividing thin film transistor is electrically connected to the ground port 2 .
  • Figure 3a shows the law of the source-drain current (Id) changing with the source-drain voltage (Vdrain) when the gate and drain of the voltage-dividing transistor T2 are electrically connected.
  • the voltage-dividing transistor T2 When the source-drain voltage (Vdrain) increases from zero, the voltage divider transistor T2 works in the linear region, and its source-drain current (Id) increases with the increase of the source-drain voltage (Vdrain). When the source-drain voltage (Vdrain ) further increases to a certain value, the voltage divider transistor T2 works in the saturation region, and its source-drain current (Id) no longer increases with the increase of the source-drain voltage (Vdrain), but tends to a certain value; 3b shows how the resistance R varies with the source-drain voltage (Vdrain) when the gate and drain of the voltage dividing transistor T2 are electrically connected.
  • the voltage dividing thin film transistor may be an amorphous silicon thin film transistor (a-Si TFT) or an indium gallium zinc oxide thin film transistor (IGZO TFT), and in this embodiment, the pixel driving circuit 10 includes only one voltage-dividing transistor T2, but in other embodiments of the present invention, the pixel driving circuit 10 may also include multiple voltage-dividing transistors, and the multiple voltage-dividing transistors may be connected in series or in parallel. Further, in other embodiments of the present invention, the voltage-dividing transistor T2 may be a voltage-dividing crystal diode.
  • the switching thin film transistor T1 is turned on, and the data signal DATA enters the drain of the switching thin film transistor T1 into the MOS transistor T3.
  • the gate and the capacitor Cs after that, the switching thin film transistor T1 is turned off, but due to the storage function of the capacitor Cs, the gate voltage of the MOS transistor T3 can still maintain the potential of the data signal DATA, so that the MOS transistor T3 is still in the conduction state,
  • the driving current enters the light-emitting diode LED through the MOS transistor T3, thereby driving the light-emitting diode LED to emit light.
  • FIG. 4a is a characteristic curve diagram of the MOS transistor T3 before the voltage divider transistor T2 is connected in series in the pixel driving circuit 10 provided by the embodiment according to the present invention.
  • FIG. 4b It is the pixel drive circuit provided by the embodiment of the present invention. After the voltage divider transistor T2 is connected in series, the characteristic curve of the MOS transistor T3.
  • the abscissa indicates the source and drain of the MOS transistor T3 Voltage (Uds)
  • its ordinate indicates the source-drain current (Ids) of MOS transistor T3
  • each curve indicates: when the gate-source voltage (Vgate) of MOS transistor T3 remains constant, its source-drain current (Ids) varies with the source The regularity of leakage voltage (Uds) change.
  • MOS transistor T3 when the gate-source voltage (Vgate) of MOS transistor T3 maintains a certain value, when its source-drain voltage (Uds) increases to a certain value, MOS transistor T3 will work in the constant current region (that is, the saturation region) , its source-drain current (Ids) no longer increases with the increase of the source-drain voltage (Uds), but tends to a certain value. Further, the greater the gate-source voltage (Vgate) of the MOS transistor T3, the greater the source-drain current (Ids) when it works in the constant current region.
  • the MOS transistor T3 works in the constant current region. At this time, if the source of the MOS transistor T3 and the ground terminal GND are not connected in series with the voltage dividing transistor T2, The gate-source voltage (Vgate) of the MOS transistor T3 is “DATA-GND”.
  • the drain of the MOS transistor T3 A large source-drain current (Ids) will be generated, which can easily exceed the maximum current allowed by the light-emitting diode LED, and a small change in the gate-source voltage (Vgate) of the MOS transistor T3 at a large value will cause The huge change of the source-drain current (Ids) is not conducive to the display control of the pixel driving circuit 10 in high gray scale.
  • the voltage divider transistor T2 is connected in series between the source of the MOS transistor T3 and the ground terminal GND, when the MOS transistor T3 receives the same grayscale voltage DATA, its gate-source voltage (Vgate) Due to being divided by the voltage divider transistor T2 (its resistance value is R), it is reduced to "DATA-GND-IR", which effectively reduces its source and drain current (Ids), and when the size of the data signal DATA occurs When changing, the variation range of the source-drain current (Ids) of the MOS transistor T3 is correspondingly reduced, so that the pixel driving circuit 10 can realize display control under high gray scale.
  • the pixel driving circuit 10 also includes a control module (not shown in the figure), which is used to adjust the power supply voltage VDD connected to the pixel driving circuit 10 so that the voltage dividing transistor T2 works in the linear region or the saturation region .
  • a control module (not shown in the figure), which is used to adjust the power supply voltage VDD connected to the pixel driving circuit 10 so that the voltage dividing transistor T2 works in the linear region or the saturation region .
  • the voltage-dividing transistor T2 can be operated in a linear region by adjusting the VDD voltage; when the MOS transistor T3 needs to be divided by a relatively small resistance
  • the voltage dividing transistor T2 can work in the saturation region by adjusting the VDD voltage.
  • the number of gray levels of the display panel is proportional to the resistance of the voltage divider transistor T2, that is, when the gray level of the display panel is higher, the resistance of the voltage divider transistor T2 is larger.
  • the voltage dividing transistor T2 is a voltage dividing thin film transistor
  • the ratio of its channel width to the channel length is proportional to the resistance of the voltage dividing thin film transistor, so the channel of the voltage dividing thin film transistor
  • the ratio of the width to the channel length is proportional to the number of gray levels of the display panel.
  • the voltage dividing transistor T2 has a first resistance value R
  • the light-emitting diode LED has a second resistance value R LED
  • the power supply connected to the pixel drive circuit 10 is The ratio of the voltage value VDD of the voltage to the sum of the first resistance value R and the second resistance value R LED is between the minimum driving current value I min and the maximum driving current value I max , that is, I min ⁇ VDD/(R +R LED ) ⁇ I max .
  • the present invention provides a pixel driving circuit 10, which is applied to a display panel.
  • the display panel includes scanning lines and data lines.
  • the pixel driving circuit 10 includes a switching thin film transistor T1, The storage module 11 and the driving light-emitting module 12, the switching thin film transistor T1 is used to receive the data signal DATA on the data line according to the scanning signal SCAN on the scanning line, so that the storage module 11 is charged by the data signal DATA, and the driving light-emitting module 12 is activated
  • the data signal DATA is driven to emit light, wherein the driving light emitting module 12 includes a driving unit 13, a light emitting unit 14 and a voltage dividing transistor T2 connected in series, the driving light emitting module 12 has a power supply voltage access port 1 and a grounding port 2, and the voltage dividing transistor T2 It is connected in series between the driving unit 13 and the grounding port 2.
  • the driving unit 13 is a voltage-dividing transistor T2.
  • the light-emitting unit 14 is driven to emit light according to the data signal DATA, so that when the data signal DATA changes, the current in the light-emitting unit 14 can increase slowly, reducing the change due to the data signal DATA received by the drive unit 13
  • the resulting change in the current in the light emitting unit 14 enables the pixel driving circuit 10 to realize display control at high gray scales.
  • the resistance value of the voltage dividing transistor T2 can be changed by adjusting the power supply voltage VDD, the The pixel driving circuit 10 has higher real-time controllability.
  • FIG. 5 is a schematic structural diagram of a mobile terminal provided according to an embodiment of the present invention.
  • the above-mentioned pixel driving circuit 10 is applied to the mobile terminal, which can be a smart phone or a tablet computer, etc., as shown in FIG.
  • the various components of the present invention and the relative positional relationship of each component can be seen intuitively.
  • the mobile terminal 100 includes a processor 101 and a memory 102 .
  • the processor 101 is electrically connected to the memory 102 .
  • the processor 101 is the control center of the mobile terminal 100. It uses various interfaces and lines to connect various parts of the entire mobile terminal. By running or loading the application program stored in the memory 102 and calling the data stored in the memory 102, the mobile terminal is executed. Various functions and processing data of the terminal, so as to monitor the mobile terminal as a whole.
  • Fig. 6 is a schematic diagram of the detailed structure of the mobile terminal provided by the embodiment of the present invention.
  • the mobile terminal can be a smart phone or a tablet computer, etc. From the figure, it can be seen intuitively that the present invention Each component, and the relative positional relationship of each component.
  • FIG. 6 shows a specific structural block diagram of the mobile terminal 100 provided by the embodiment of the present invention.
  • the mobile terminal 100 may include a radio frequency (RF, Radio Frequency) circuit 110, a memory 120 including one or more computer-readable storage media, an input unit 130, a display unit 140, a sensor 150, an audio circuit 160.
  • a transmission module 170 (such as wireless fidelity, WiFi, Wireless Fidelity), a processor 180 including one or more processing cores, and a power supply 190 and other components.
  • RF Radio Frequency
  • a transmission module 170 such as wireless fidelity, WiFi, Wireless Fidelity
  • a processor 180 including one or more processing cores
  • a power supply 190 and other components.
  • the RF circuit 110 is used to receive and send electromagnetic waves, realize mutual conversion between electromagnetic waves and electrical signals, and communicate with communication networks or other devices.
  • the RF circuit 110 may include various existing circuit components for performing these functions, such as antennas, radio frequency transceivers, digital signal processors, encryption/decryption chips, Subscriber Identity Module (SIM) cards, memory, and the like.
  • the RF circuit 110 can communicate with various networks such as the Internet, intranet, wireless network, or communicate with other devices through the wireless network.
  • the wireless network mentioned above may include a cellular telephone network, a wireless local area network or a metropolitan area network.
  • the wireless network mentioned above can use various communication standards, protocols and technologies, including but not limited to Global System for Mobile Communication (GSM), Enhanced Mobile Communication Technology (Enhanced Data GSM Environment, EDGE), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (Code Division Access, CDMA), time division multiple access technology (Time Division Multiple Access, TDMA), wireless fidelity technology (Wireless Fidelity, Wi-Fi) (such as the Institute of Electrical and Electronics Engineers standard IEEE 802.11a, IEEE 802.11b, IEEE802.11g and/or IEEE 802.11n), Voice over Internet Protocol (VoIP), Worldwide Interoperability for Microwave Access, Wi-Max), other protocols for mail, instant messaging, and short messaging, and any other suitable communication protocol, even those that have not yet been developed.
  • GSM Global System for Mobile Communication
  • EDGE Enhanced Mobile Communication Technology
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • Time Division Multiple Access Time Division Multiple Access
  • TDMA time division multiple access technology
  • Wi-Fi wireless
  • the memory 120 can be used to store software programs and modules, such as the corresponding program instructions in the above-mentioned audio power amplifier control method, and the processor 180 executes various functional applications and data processing by running the software programs and modules stored in the memory 120, that is, realizes The frequency of the information transmission signal transmitted by the mobile terminal 100 is acquired. Functions such as generating jamming signals.
  • the memory 120 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 120 may further include a memory remotely located relative to the processor 180, and these remote memories may be connected to the mobile terminal 100 through a network. Examples of the aforementioned networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.
  • the input unit 130 can be used to receive input numbers or character information, and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.
  • the input unit 130 may include a touch-sensitive surface 131 and other input devices 132 .
  • the touch-sensitive surface 131 also referred to as a touch display screen or a touchpad, can collect user touch operations on or near it (for example, the user uses any suitable object or accessory such as a finger, a stylus, etc. on the touch-sensitive surface 131 or on operation near the touch-sensitive surface 131), and drive the corresponding connection device according to the preset program.
  • the touch-sensitive surface 131 may include two parts: a touch detection device and a touch controller.
  • the touch detection device detects the user's touch orientation, and detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into contact coordinates, and sends it to the to the processor 180, and can receive and execute commands sent by the processor 180.
  • the touch-sensitive surface 131 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic wave.
  • the input unit 130 may also include other input devices 132 .
  • other input devices 132 may include, but are not limited to, one or more of physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, joysticks, and the like.
  • the display unit 140 can be used to display information input by or provided to the user and various graphical user interfaces of the mobile terminal 100, which can be composed of graphics, text, icons, videos and any combination thereof.
  • the display unit 140 may include a display panel 141.
  • the display panel 141 may be configured in the form of LCD (Liquid Crystal Display, Liquid Crystal Display), OLED (Organic Light-Emitting Diode, Organic Light-Emitting Diode), and the like.
  • the touch-sensitive surface 131 may cover the display panel 141, and when the touch-sensitive surface 131 detects a touch operation on or near it, the touch operation is sent to the processor 180 to determine the type of the touch event, and then the processor 180 determines the type of the touch event according to the type of the touch event.
  • the type provides a corresponding visual output on the display panel 141 .
  • the touch-sensitive surface 131 and the display panel 141 are used as two independent components to realize the input and output functions, in some embodiments, the touch-sensitive surface 131 and the display panel 141 can be integrated to realize the input and output functions. output function.
  • the mobile terminal 100 may also include at least one sensor 150, such as a light sensor, a motion sensor, and other sensors.
  • the light sensor may include an ambient light sensor and a proximity sensor, wherein the ambient light sensor may adjust the brightness of the display panel 141 according to the brightness of the ambient light, and the proximity sensor may generate an interruption when the flip is closed or closed.
  • the gravitational acceleration sensor can detect the magnitude of acceleration in various directions (generally three axes), and can detect the magnitude and direction of gravity when it is stationary, and can be used for applications that recognize the attitude of mobile phones (such as horizontal and vertical screen switching, related Games, magnetometer posture calibration), vibration recognition related functions (such as pedometer, tap), etc.; as for other sensors such as gyroscope, barometer, hygrometer, thermometer, infrared sensor, etc. that can also be configured on the mobile terminal 100, here No longer.
  • the audio circuit 160 , the speaker 161 and the microphone 162 can provide an audio interface between the user and the mobile terminal 100 .
  • the audio circuit 160 can transmit the electrical signal converted from the received audio data to the loudspeaker 161, and the loudspeaker 161 converts it into an audio signal output; After being received, it is converted into audio data, and then the audio data is processed by the output processor 180, and then sent to another terminal through the RF circuit 110, or the audio data is output to the memory 120 for further processing.
  • the audio circuit 160 may also include an earphone jack to provide communication between an external earphone and the mobile terminal 100 .
  • the mobile terminal 100 can help the user receive requests, send information, etc. through the transmission module 170 (such as the Wi-Fi module), which provides the user with wireless broadband Internet access.
  • the transmission module 170 is shown in the figure, it can be understood that it is not an essential component of the mobile terminal 100, and can be completely omitted as required without changing the essence of the invention.
  • the processor 180 is the control center of the mobile terminal 100. It uses various interfaces and lines to connect various parts of the entire mobile phone, and runs or executes software programs and/or modules stored in the memory 120, and calls data stored in the memory 120. , execute various functions and process data of the mobile terminal 100, so as to monitor the mobile terminal as a whole.
  • the processor 180 may include one or more processing cores; in some embodiments, the processor 180 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface and applications, etc., and the modem processor mainly handles wireless communications. Understandably, the foregoing modem processor may not be integrated into the processor 180 .
  • the mobile terminal 100 also includes a power supply 190 (such as a battery) for supplying power to various components.
  • the power supply can be logically connected to the processor 180 through a power management system, so as to manage charging, discharging, and power consumption through the power management system. Management and other functions.
  • the power supply 190 may also include one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, power status indicators, and other arbitrary components.
  • the mobile terminal 100 also includes a camera (such as a front camera, a rear camera, etc.), a bluetooth module, a flashlight, etc., which will not be repeated here.
  • the display unit of the mobile terminal 100 is a touch screen display.
  • the present invention can also have other implementations. All technical solutions formed by equivalent replacement or equivalent replacement fall within the scope of protection required by the present invention.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of El Displays (AREA)

Abstract

L'invention concerne un circuit d'attaque de pixel (10) et un terminal mobile. Le circuit d'attaque de pixel (10) comprend : un transistor à couches minces de commutation (T1) utilisé pour recevoir un signal de données en fonction d'un signal de balayage, un module de stockage (11) utilisé pour être chargé par le signal de données, et un module électroluminescent d'attaque (12). Le module électroluminescent d'attaque (12) comprend une unité d'attaque (13), une unité électroluminescente (14) et un transistor diviseur de tension (T2) reliés en série, et a également un port de mise à la terre (2), utilisé pour être amené par le signal de données à émettre de la lumière. Le transistor diviseur de tension (T2) est relié en série entre l'unité d'attaque (13) et le port de mise à la terre (2).
PCT/CN2021/111781 2021-08-02 2021-08-10 Circuit d'attaque de pixel et terminal mobile WO2023010593A1 (fr)

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CN202110882071.9A CN113674702A (zh) 2021-08-02 2021-08-02 像素驱动电路以及移动终端

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